stdev
The stdev function calculates the standard deviation of the set
of numbers in the specified measure, grouped by the chosen dimension or
dimensions, based on a sample.
Syntax
stdev(measure, [group-by level])
Arguments
- measure
-
The argument must be a measure. Null values are omitted from the results. Literal values don't work. The argument must be a field.
- group-by level
-
(Optional) Specifies the level to group the aggregation by. The level added can be any dimension or dimensions independent of the dimensions added to the visual.
The argument must be a dimension field. The group-by level must be enclosed in square brackets
[ ]. For more information, see LAC-A functions.
Examples
The following example returns the standard deviation of test scores for a class, using a sample of the test scores recorded.
stdev({Score})
You can also specify at what level to group the computation using one or more dimensions in the view or in your dataset. This is called a LAC-A function. For more information about LAC-A functions, see LAC-A functions. The following example calculates the standard deviation of test scores at the subject level, but not across other dimensions (Class) in the visual.
stdev({Score}, [Subject])